FLIES OF THE GENUS OGCODES — SCHLINGER 261 



The paratopotype agrees essentially with the holotype, differing 

 only in having a little more brown on the abdomen as follows: a small 

 median spot on tergite iii, and most of the posterior two-thirds of v. 

 The paratype is 7.00 mm. long; its wing length 6.70 mm. 



Remarks: This species is closely related to nitens (Hutton), but 

 is easily separated by the lighter coloration, larger size, and structure 

 of the male genitaha (see pi. 9, figs. 52-53; pi. 12, figs. 89-90). The 

 Nearctic species colei Sabrosky shows a very close resemblance to 

 this new species but differs mainly in the characters cited above for 

 nitens. The name argigaster refers to the white abdomen. 



Ogcodes {Ogcodes) nitens (Hutton) 



Plate figures 52, 79, 90 



Hcnops nitens Hutton, New Zealand Inst. Trans., vol. 33, p. 29, 1901. 



Oncodes bnmnciis, Brunetti, in part (?), Ann. Mag. Nat. Hist., vol. 18, p. 594, 1926. 



Oncodcs nitens, Paramonov, Pacific Sci., vol. 9, p. 24 (?), 1955. 



Type locality: Auckland and Wellington, New Zealand (Canter- 

 bury Museum, New Zealand). 



Diagnosis: Species of group iv. Male with brown and white 

 maculated abdomen. 



Thorax shining black, covered with long dense whitish brown pile 

 which appears dark brown at its base; legs mostly dark brown, tibiae 

 and tarsi somewhat lighter brown; wing transparent, wing veins pale, 

 vein Ml a faint crease, crossvein m-cu present, r-m crossvein absent; 

 squama opaque white, hyaline near margin which is narrowly brownish 

 yellow. 



Abdomen shining dark brown except usually for posterior margins 

 of sternites, posterior lateral margin of tergite ii, large mesolateral 

 spots on III and iv, and narrow posterior fasciae on ii-v which are 

 white to brownish white; dorsum covered with long white pile along 

 lateral margins and median area of tergites ii-iv, with short white 

 pile on mesolateral area of tergite ii, remainder of abdomen mostly 

 bare and shining. 



Genitalia small, aedeagus pointed apically (pi. 9, fig. 52); ejaculatory 

 apodeme with long, narrow median plate in lateral view (pi. 12, 

 fig. 90); wings bent downwards (pi. 11, fig- 79). 



Discussion: This species has never been clearly defined and 

 Button's description (1901) is entirely too brief to be useful. 

 Paramonov (1955) saw no specimens of nitens, and to my knowledge 

 no records since Hutton have been given. Paramonov's key to the 

 New Zealand species was erroneous as he contended that both the 

 abdomen and its pile were black, whereas Hutton (1901, p. 29) clearly 

 stated ". . . a spot on each side of the second and third abdominal 

 segments, tawny." The specimens examined by me, and upon which 



